Hook rule



Aug. 24 1926.V 1,597,058

J. W. CRAWFORD Hook RULE Filed June 29, k15923 w mmm/(4% Inventar floluzWUIwIl//u'd Patented Aug. 24, 1926.r

eNir-snstares PATENT orties.

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COMPANY, or Arnon, Messner-susurra .e Genie-emision orivrAssAcHU-su'rrs.,

nooirnutn.

iippiieamg rues Junefaaiaaa y serial No. eisten.v

This invention relates to measuring devices` and particularly suchdevices as. the socalled hook rule.- As illustrative of my invention I have shown and will discuss auch a rule pointing out therein the advantages and improvements in accordance with my invention.

Throughout the specification and' drawings have indicated corresponding parts by iai like letters of reference and in the drawings.

member 1` is vpreferably provided with gradf e nations on both edges of both faces l@L and 1b as shown in, Figsl and 2. These. usually are divided into dilierent graduationsor systems of graduations as for example, eighths, sixteenths, thirty-seconds and 'six- Jty-iourths7` the same being unit readings for different measurements, the device bein-gre versi'ble for that purpose. .ln a device oitthi's Ysort the matter otreversiibili'ty has heretofore been somewhat ditlicult andy usually only accomplished by making an adjustment or a reversing of the hook. `Furthermore, the size ot the hook has usually been lined and. not capable oty any variation, the same being standard for all work under all conditions. The requirements under varying condition-s are or course widely varied and sometimes a much longer hook is required than4 at others. f Y

In accordance with; my invention l provide the head end-ot my rule with a care fully ground square endlc. On this l mount the head 2which is slotted to receivethe said squared end overlapping it as at 2a. overlapping` portions 2EL side so as to expose theI graduations up to the end of the member l; so that readings close to the hook can be made on either side without diliiculty. The recessin the head 2 is extended asat 2P andV provides a bearing for the hoek 3 which is et slightly greater leeg-'rh the width et the head 2 so The are cut away on each give normally uniform projection on each side suiiicient for minimum hook engagement in making ordinary measurements.

The head receiving end ofthe member l is centrally provided with. a large aperture il. through which passes a stud 5 having an,V ec,- centric bearing 51 in the aperture Il. rthe stud head is preferably provided with. al convenient screw driver slot so that it can, be turned to give a cam tightening to the head 2 so thatthe hook member 3. can be clamped firmly on the squared end surface le.y In this way the hook member 3 may be adjusted as desired as indicated in dotted linesinFig. e.

or be clamped in any other desired position.

y rEhe immediate availibility of all four sca-les is of greatest Convenience not only for direct readings of' measurement'butv 'for the settingv of inside calipers or dividers where the hooks 8 or the tour angular cor- -ners or abutment shoulders 2cigive convenient bearing;V tor one leg.

device lis therefore not only all times i reversible so as to give any reading but is.

also Aadjustable to any position of hook and is at the saine time in a form ready for con.- venient and economical manufacture.

Various moditications inthe form and construction ot my device may obviously be resorted to, all without departing from the spirit ofmy invention it' within the', limits ot the appended claims.

Y What I theretore claim and desire lto cure by Letters Patentv is Y l. A hook rule comprisingga double-edged' scale member having,` graduations. on both edges of both sides, a slottedhead' adapted to receive one end of'fsaid scale member., a .Y

hook member disposed between the bottom of the slot and said end, andv meansjtor adjeustablyl clamping said; head on said end to adjustably hold SaidA hook member.

2. A hook rule,"compri'sing,i a double-edged I scale member having; graduations on both edge's of bothT sides, a slotted head adapted toreceive one end of said scale member, a

-hook member disposed between the bottomof the slot and said end', and meansv for ad. justably clamping said head on said end to adjustably hold the said hook member, the

.sides ot' said head adjacent the slotted section being v reduced to expose said graduations.

3. A hook rule, comprising a graduated' rule member having* a squared end7 a head applied to said rule member at the squared end thereof, a hook adjustable transversely of the rule member and between said head and the squared end of said rule member, and means for releasably holding the head in engagement with the hook `to* maintain the adjustment of the latter.

t. A hook rule comprising a graduated rule member, a head applied thereto at one end thereof and having a transverse slot, a hook adjustable in said slot between said head and the end of the rule member, and means for releasably holding the head in engagement with the hook to maintain the adjustment of the latter.

5. A hook rule comprising a flat doubleedged rule member having a squared end and having graduations along both edges of both faces, a transversely slotted head of substantially the width of said rule member and over-lapping both faces of said rule member adjacent the squared end thereof, the overlapping portions on both faces of said head being reduced to expose the graduations of the rule member and said reduced portions providing a pair of abutment shoulders disposed parallel to the squared end of the rule member, a hook adjustable transversely between said squared end of the rule member and the head, and means for releasably holding the head in engagement with the hook to maintain the adjustment of the latter.

6. A hook rule comprising a fiat doublezdged rule member having a squared end and having graduations along both edges of both faces, a transversely slotted head of substantially the width of said rule member and overlapping both faces of said rule member adjacent the squared end thereof. the over-lapping portions on both faces of said head being reduced to expose the graduations of the rule member and said reduced portions providing pairs of abutment shoulders disposed at right angles to each other, one pair of said shoulders being parallel with the squared end of the rule member and the other pair of shoulders being paral-l lel with the edges of the rule member, a hook adjustable transversely between said squared end of the rule member and the head. and means for releasably holding the head in engagement with the hook to maintain the adjustment 0f the latter.

7. A hook rule comprising a fiat double edged rule member having a squared end and having graduations along both edges of both faces` a transversely slotted head of substantially vthe width of said rule member and over-lapping both faces of said rule member adjacent the squared end thereof. the over-lapping portions on both faces of said head beingl reduced to expose the graduations of the rule member and said reduced portions providing pairs of abutment shoulders disposed at right angles to each other, one pair of said shoulders being parallel with the squared end of the rule member and the other pair of shoulders being paral lel with the edges of the rule member, a hook of greater length than the width of the rule member and adjustable transversely along the squared endof the rule member in the slot of said head, and means for releasably holdingthe head in engagement with the hook to maintain the adjustment of the latter.

8. A hook rule comprising a graduated rule member having a squared end, a transversely slotted head overlapping the faces of said rule member at the squared end thereof, the overlapping` portions at the edges of said head being cut away to expose the graduations of the rule member adjacent the squared end of the rule member, a hook adjustable transversely between said squared end of the rule member and said head, and means for releasably holding the head in engagement with the hook to maintain the adjustment of the latter.

9. In combination with a rule, a hook engaged on one of its side edges with and adjustable along an end edge of the rule, a transversely slotted head engaged with the opposite side edge of the hook and with the opposed side faces of' the rule, and a single fastening means for connecting the head to the rule and for clamping the hook in justed position.

10. In combination with a rule, a hook member having a side edge slidably engaged with an end edge of the rule, so as to be adjustable transversely of the rule, a transversely slotted head straddling said end of the rule and releasably holding the hook in engagement withjthe rule end, and means for securing the head to the rule and for clamp ing the hook in adjusted position.

ll. In combination with a rule. a substantially U-shaped head applied thereto at one end thereof. a hook member disposed loetween the closed end of therhead and the ad jacent end edge ofthe rule for adjustment transversely thereof, a means for vconnecting' the head to the rule and for clamping the hook member in yadjusted position.

1Q. A hook rule, comprising a rule member, Aa transversely slotted head applied thereto adjacent one end and presenting a slideway disposed transversely of the rule, hook adjustable in said slideway perpendicularly to the longitudinal asis ofthe rule, and means for holding the adjust-ment of said hook. y

In testimony whereof I aflifi mv signature,

JOHN lV. CRAWFOR), 

